From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Fri, 24 May 2013 22:55:28 +0000 (-0700)
Subject: drivers/block/brd.c: fix brd_lookup_page() race
X-Git-Tag: v3.10-rc3~12^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dfd20b2b174d3a9b258ea3b7a35ead33576587b1;p=pandora-kernel.git

drivers/block/brd.c: fix brd_lookup_page() race

The index on the page must be set before it is inserted in the radix
tree.  Otherwise there is a small race which can occur during lookup
where the page can be found with the incorrect index.  This will trigger
the BUG_ON() in brd_lookup_page().

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reported-by: Chris Wedgwood <cw@f00f.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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